Expose index-header lazy load option and recommends bucket index #3758
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What this PR does:
The index-header lazy loading was built in #3498 and released in Cortex 1.6.0, but we never exposed its config because we were dubious about potential side effects. We're now running in production and looks fine, so I would suggest to expose its config option.
Moreover, our confidence on bucket index has increased, so I would start recommending it in our production tips.
Which issue(s) this PR fixes:
N/A
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]